Renovating a Pool Without Draining It: Techniques and When It's Possible
One of the most frequently asked questions we receive in the industry is: Can a pool be renovated or repaired without draining it? The short answer is: it depends on the type and scope of the work. In this article, we explain in detail which repairs can be done with the water still in the pool and which ones require draining the pool, with a special focus on pools lined with reinforced liner.
Repairs That CAN Be Done Without Draining the Pool
There are a number of minor repairs that can be performed while the pool is full or partially full:
Repairing small tears or punctures in reinforced liner: PVC liners can be repaired underwater using special self-adhesive patches or through cold welding with polyurethane adhesives. This type of repair is possible when the damage is localized (a tear less than 10 cm long, a small puncture, or a seam that has slightly come apart).
Replacement of nozzles, brackets, or small plumbing components: Using balloon plugs or special caps, a professional diver can replace certain plumbing parts without draining the pool.
Adjustment and replacement of pool lights: Pool lights are designed to be removed while the pool is full using a guide cable that connects them to the housing. This is a routine procedure that does not require draining the pool.
Repairing ladders or accessories: Stainless steel ladders, handrails, and other accessories can be replaced without draining the pool.
When It Is MANDATORY to Drain the Pool
There are situations in which completely draining the pool is unavoidable:
Complete replacement of the reinforced liner: If the liner has reached the end of its useful life, has multiple areas of deterioration, widespread blistering, or leaks at the seams, the definitive solution is to install a new liner. This process requires draining the pool, removing the old liner, preparing the surface, and welding the new liner in place. It is the most comprehensive renovation and guarantees another 10–15 years of perfect waterproofing.
Structural repairs to the concrete: If the pool structure has significant cracks, severe efflorescence, or damage caused by ground pressure, the pool must be drained so that work can be performed on the dry concrete.
Changing the lining system: Switching from mosaic tiles to reinforced liner, or from paint to reinforced liner, always requires draining the pool and preparing the surface.
Underwater Repair Techniques for Reinforced Membranes
Underwater repair of reinforced membrane is a specialized procedure performed by technicians using diving equipment or surface-supplied breathing systems. The steps are as follows:
First, the exact location of the leak is identified through visual inspection or by injecting a contrast dye near the suspected areas. Once located, the area to be repaired is cleaned with a nylon brush to remove algae and deposits. Next, the PVC patch is applied using a contact adhesive specifically designed for underwater use, pressing firmly for several minutes. Finally, the repair is verified by ensuring there are no bubbles under the patch.
This type of repair is a temporary or emergency solution. Whenever possible, it is preferable to drain the pool and perform the repair on dry land for greater durability and reliability.
The Importance of a Professional Assessment
Before deciding whether or not to drain the pool, it is essential that a professional assess the actual condition of the liner. A poorly executed underwater repair may only provide a few months of additional service life, while a complete renovation with a new reinforced liner can resolve the problem for the next decade.
At ArgPiscinas, we conduct free inspections of your pool’s condition and advise you on the most cost-effective solution: a spot repair or a complete renovation with reinforced liner. Visit argpiscinas.es and contact our technical team. The initial consultation is no-obligation and free of charge.
https://www.argpiscinas.es/en/blog/reformar-piscina-sin-vaciar-tecnicas